| 摘要 |
PROBLEM TO BE SOLVED: To improve the measurement accuracy of an ultrasonic flow rate measuring device. SOLUTION: The ultrasonic flow rate measuring device is equipped with a correlation calculating section 31 which executes a correlation calculation between a first time reception waveform f<SB>1</SB>which is transmitted from an ultrasonic probe 21A on the upstream side and received by an ultrasonic probe 21B on the downstream side, and a second time receiving waveform f<SB>2</SB>used as a comparison waveform, and further executes correlation calculation between the first time receiving waveform f<SB>1</SB>which is transmitted from the ultrasonic probe 21B on the downstream side and received by the ultrasonic probe 21A on the upstream side, and the second time receiving waveform f<SB>2</SB>used as the comparison waveform. A decision section 32 derives the arrival the timingsΔt<SP>+</SP>,Δt<SP>-</SP>required for calculating arrival the times t<SP>+</SP>, t<SP>-</SP>, based on the result of calculations executed by the correlation calculating section 31. COPYRIGHT: (C)2006,JPO&NCIPI
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